在对长轴分别平行于板法向(ND)、轧向(RD)、横向(TD)的柱状晶样品冷轧组织及织构演变规律分析的基础上, 利用XRD与EBSD技术, 对不同退火温度下各样品再结晶织构的形成规律进行分析. 结果表明, 柱状晶样品再结晶织构的演变, 一方面体现了初始取向晶粒的“遗传性”, 即立方织构与Goss织构的形成; 另一方面又展示了柱状晶样品不同于单晶及多晶的“特殊性”, 即{113} 织构的形成、Goss晶粒大大超过立方晶粒的生长能力及TD样品中{110}<110>取向晶粒的消失. 退火温度的变化在不同样品中可造成立方织构的增强或减弱, 这取决于再结晶时的形核及长大环境, 分析认为TD样品低温时形成最强的立方织构与其在冷轧过程中最强的晶界阻力有关. 综合考虑各再结晶织构的转变规律, 其形成与定向形核及定向长大均相关. 研究还证实, 3种柱状晶样品中等压下量冷轧并退火后都可抑制γ线织构的形成.
Columnar grains commonly exist in the cast slabs of Fe-3%Si electrical steels and exert, due to their topographic and crystallographic anisotropies, strong influence on the microstructure and texture during following hot-rolling, cold-rolling and annealing. Based on the previous paper addressing the cold-rolling texture evolution in the electrical steels with different alignments of columnar grains, this work illustrates further the recrystallization texture evolution at different annealing temperatures by means of XRD and EBSD techniques. The results show that the recrystallization texture evolution represents, on the one hand, the ‘heritage’ of the initial orientations, concerning the formation of cube and Goss texture. On the other hand, specific features are determined from different types of recrystallized columnar grains specimens, namely, the formation of the {113} texture, the more significant growth of Goss grains than that of cube grains in RD specimens (with initial columnar grains' longitudinal axis being along rolling direction) and the vanishing of {110}<110> grains in TD specimens, which have been scarcely reported in single crystals or in polycrystalline bcc materials composed of equiaxed grains. The dissimilar recrystallization environments lead to distinct evolution of cube texture at various annealing temperature, and the highest intensity of cube texture at low annealing temperature in TD specimen is believed to be related with the strong effect of transverse directional alignments of columnar grain boundaries. Regarding the cube and Goss recrystallization textures, their formation can be explained in terms of the theories of both oriented nucleation and oriented growth. In addition, this study also confirms that {111} texture can be suppressed effectively in the columnar grain specimens after cold--rolling at intermediate reduction and annealing.
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